The chemical composition of subducting sediment and its consequences for the crust and mantle

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  • Yasukawa Kazutaka
    Department of Systems Innovation, School of Engineering, The University of Tokyo
  • Nakamura Kentaro
    Department of Systems Innovation, School of Engineering, The University of Tokyo Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Fujinaga Koichiro
    Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo
  • Machida Shiki
    Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Ohta Junichiro
    Department of Systems Innovation, School of Engineering, The University of Tokyo
  • Takaya Yutaro
    Department of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University
  • Kato Yasuhiro
    Department of Systems Innovation, School of Engineering, The University of Tokyo Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo

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  • Rare-earth, major, and trace element geochemistry of deep-sea sediments in the Indian Ocean: Implications for the potential distribution of REY-rich mud in the Indian Ocean

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We analyzed 1338 deep-sea sediment samples from 19 Deep Sea Drilling Project/Ocean Drilling Program sites covering a large portion of the Indian Ocean, and constructed a new and comprehensive data set of their bulk chemical compositions, including rare-earth, major, and trace elements. The bulk-sediment rare-earth and yttrium (REY) composition of the REY-enriched samples, characterized by relatively small negative Ce anomalies, almost no Y anomalies, and enrichment in heavy rare-earth elements, can be interpreted as the superposition of the REY compositions of apatite and hydrogenous Fe-Mn oxides. Although the hydrothermal component is a key factor in the formation of REY-rich mud in the Pacific Ocean, it is less important in the Indian Ocean, probably because there is less hydrothermal input of Fe-oxyhydroxides from seafloor hydrothermal vents there. The relationships among Fe2O3, MnO, P2O5, Co, and total REY contents suggest that a primary factor controlling REY enrichment in deep-sea sediments is the sedimentation rate. A low sedimentation rate allows both fish debris apatite and hydrogenous Fe-Mn (oxyhydr)oxides to accumulate in the surface sediments. On the basis of these results, we identified two potential areas in the Indian Ocean where REY-rich mud may be present in surface sediments: the south-southeastern Wharton Basin and the southern Central Indian Ocean Basin. The resource potential of the latter area might be particularly high if the distributions of REY-rich mud and Fe-Mn nodule fields broadly overlap.

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